Abstract
The simultaneous realization of low propagation loss and subwavelength mode localization remains one of the critical challenges in plasmonics. Aiming to simultaneously realize low propagation loss and subwavelength mode localization in plasmonics, we introduce a class of low-loss and deeply confined guiding schemes utilizing an alternative plasmonic material, i.e., a superconductor (SC). The optical properties of a SC–insulator–SC (SCISC) waveguide are analyzed both at terahertz (THz) and telecommunication (TC) frequencies. The SCISC waveguide features a deep-subwavelength confinement with a mode length as small as λ/6000 (λ/18) for THz (TC) frequency, while the propagation length can be extended up to 400 mm (1 mm).
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